Paper-cutting machine



(No Model.) 2 Sheets-Sheet 2. H. T. C.K BAUS. r BAPERIGUTTING MACHINE.No. 296,184. Patented Apr..1,.188 4.

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y of the main and some subordinate levers on .automatic or self clampingby means of the Nrrn STATES 'PATENT HERMAN T. C. KRAUS, OF BROOKLYN,NEWv YORK, ASSGNOR TO GEORGE E. SANBORN, OF CHICAGO,f ILLIXOIS.

PAPER=CUTTING MACHINE.

SPECIFICATION forming part oi' Letters Patent No. 296,184, dated Aprill, 1884.

Application filed February 23,1883. (Nomodel.)

To @Z3 whom, t may concern:

Be it known that I, HERMAN T. C. Knaus, a naturalized citizen oftheUnited States, residing at No. 15 Stagg street, Brooklyn, in the countyof Kings, State of New York, have invented a new and usefulPaper-Gutting Machine, (for which have obtained no patent What-even) ofwhich the following is a specification.

My invention relates to improvements in paper-cutting machines in whicha knife operates from above upon a table iii-cutting, and in which thepaper is firmly clamped during the process of cutting; and the principalobject of my invention is to provide means for same power that isemployed in operating the knife. I attain this and other objects by themechanism illustrated in the accompanying drawings, in Whieh- Figure lis a sectional view cut at one side of the center, sh owing all theparts connected with the clamping and cutting'` Fig. 2 is a total frontview of the machine. Fig. 3 is a top view, looking doivu upon thesection cut at line a' ar, and showing gear G, Fig. 2. Fig. 4 isasectional view of the clamping devices, cut at right angles to that ofthe same parts shown in Fig. l. Fig. 5 is a vertical section from thetop of the table, cut through the pivotal points line y y, Fig. l. Fig.6 is an elevation of the yoke lin which the crank-shaft has its bearing,the driving-shaftbcaring and frame being in section.

Similar letters refer to similar parts throughout the several views.

I avoid the objections made to selfclamping paper-cutters in which theknife moves up to the paper from below, and to some extent is concealedby the paper when in the act of cutting, by placing the knife above andmoving it down upon the paper inplain sight, and by operating the clampalso from above independently in advance of any movement of the knife,and while it is at rest, and Without interfering with any subsequentmovements of the cutting apparatus and its operating mechanism.

A is the Working-arm, operated (one on each side of the machine) by thecrank C on crankshaft S', upon which the driving-gear G is placed, andinto which the pinion P on the driving-shaft S Works. The arm A hasforits primary fulcrum the lever-shaft Si, both ends u of which rest inthe curved slot T, which is in the main frame F. The crank-arm A2 isprovided With a roller, R,ivl1ich Works in the slot T and operates theworking-arm A. At its opposite end the arm A is connected with theknife-bar B and knife K through the connecting-rod D, the cross-bar B",and the connecting-rod D. Y

U is the driving-pulley on the shaft S, and U a ily-wheel ou the sameshaft. l

M is' the clamp, which is operated in two Ways: first, for purposes ofadjustment, by or through the arm Ai; and, second, during the cutting bythe arm A and the intermediate devices.

B2 is the clamp-bai-,which sustains the clamp in its uppermost positionupon the pin I, which last is secured in the lower end of the link L,and moves in the slot T in the lon-'er part of the link L. The link L isone limb of a toggle, the other limb being L2, the upper end of whichWorks upon the pin F, secured in the clamp-bar Bi, and thereby sustainsthe clamp and clamp-bar in the uppermost position when the arm A is inthe position shown in Fig. l, where it is held by a pin, li, or in anyusual manner, for that purpose. Vhen the arm A is` released from thecontrol of the pin I", the clamp M Will ,drop automatically as for asthe table-top F', unless a pile of paper, having been placed thereon,intervenes and stops it. This movement is caused by the Weight of theclamp and itsl attachments, and carries the associated parts with it, asfollows: The toggle-links L and L2, connected at the pin l", Whereto thelink` L is also attached, in dropping, are partially controlled by thelink L3, and bent slightly out of a straight line thereby, the other endof the link Iii being still held nearly stationary upon the pin F. Thepreliminary clamping of the paper is thus accomplished.` The clamphaving once dropped to its lowest point, or to any intermediate point,may be again raised by means of the arm A2, and there held by the pin I.In fact, the clamp is under the control of the arm Ai. Vhen the clamp Mhas reached and rests upon the paper, the drivingshaft may be set inoperation, in any-ordinary way, to operate the knife and knife-bar. Thefirst effect of this movement is to raise the slotted end of the arm A,and thereby still further depress the clamp M. This is done through theconnecting-rod D2, crank-bar C, link L3, and toggles L2 and L', andbefore there is any considerable movement of the knife, for the reasonthat the long arm of the crank-lever C is attached to the toggles, andthe short armto the connecting-rod D2, which gives amaterially-increased movement to the clamp and bar B2. The clamp willnot be moved to any considerable extent if the arm A3 has beenpreviously released, as described, but if it has not been, then thetoggles and connections being drawn toward the positions shown in dottedlines, the clamp will be brought down automatically and independently ofthe arm A3 by the arm A. The link L', being slotted at'its lower end,permits the movement of the toggles toward the positions of the dottedlines, whatever variable thickness of paper may be under the clamp, andtherefore the movements of the rest of the machinery cannot be checkedby this member of the toggle, as it would be if there were no slot forthe pin I to move in.

The subsequent clamping during the cutting is divided into twopartsAboth of them under the control of the arm A, as follows: first,through the connecting-rod D3 and arm A, and, second, through the armA5, link L, and toothed segment-lever arm A5, the teeth of which take inthe teeth shown on the clampbar B2. The operation is asfollows: O nstarting the driving-shaft, raising the slotted end of the arm A, anddepressing its other end, the connecting-rod D2 draws down the arm A2,forcing its roller B/ against the back side of the clamp-bar B2, and theroller R2, at its other end, against thefar side of the slot T, whichinclines inward and upward, so as to force the roller R with anincreasing pressure against the clamp-bar B2 as the arm A continues tomove. The clamp-bar B2 is held by guide-blocks E, so that the roller Bwill have sufficient grip on the clamp-bar to hold the paper forcutting. In some cases-as where the paper is very hard to cut-stillfurther clamping pressure is required; and this I attain by means whichI will now describe. The moment the knife meets with such resistance asto stop or delay the cutting action of the knife, the continued movementof the crank C Will lift the arm A and its shaft S2, thereby changingthe fulcrum from that shaft to the pin I, which receives theconnecting-rod D, thereby causing the arm A5 to force the link L*against the roller B2, thereby pushing the toothed segment-arm A6 (thepin I7 of which moves in a slot, T", for that purpose) into engagementwith the teeth of the clamp-bar B2. Continued upward movement of theslotted end of the arm A causes the arm AG to turn on its pin I2, and,pushing powerfully against the roller R, as well as downward, to forcethe clamp down upon the paper with additional pressure when required.The slot T relieves the arm A 'and its shaft S2 during this movement,and eventually the shaft S2 becomes again the fulcrum, whereby the otherend oi' the arm A, the connectingrod D, and the knife are furtherdepressed and the cutting is finished. The continued movement of thedriving-shaft reverses the arm A and restores it and its attachment tothe positions shown in Fig. l. There are two arms A, and attachmentsalso in duplicate, in each side of the machine, as shown in Fig. 2.

The knife-bar is shown suspended in the usual manner on the links XV IV,but any equivalent devices may be used for giving the diagonal cut.

I have'provided for the adjustment of the knife, as it wears, by meansof the screws and nut N N at each end thereof through and upon theintermediate cross-bar, B.

The arm A5 is not rigid, but has a slight motion. It should be madestrong, as it sustains, through the shaft S2, substantially the entireupward pressure of the arm A in cutting.

The link L5 connects the link L and arm A2.

I claim as my inventionl l. In a paper-cutting machine, the clampsupported by the clamp-bar B2, and the links L andL2,resting upon thepins I, in combination with the link L andarm A, for the purpose ofcontrolling the preliminary adjustment of the clamp, substantially asshown and described.

2.- The arm A, connecting-rod D2, cranklever Gf, arm L2, toggle-links Land L2, and the clamp-bar B2, in combination, for the purpose ofcontrolling the adjustment ofthe clamp.

3. In a paper-cutting machine, the arm A and shaft S2, in combinationwith the arm A5, link L, roller R2, and the toothed segmentarm A6.

4. The combination of the arm A, connecting-rod D2, arm A, rollers B andR2, the latter working in the inclined slot T, and clampbar B2, as setforth.

5. AIn a paper-cutting machine, arm A, arm Ai, link L, toothedsegment-arm A, pin I2, and toothed clamp-bar B2, in combination, as andfor the purpose set forth.

HERMAN T. C. KRAIIS.I

Vitnesses:

JAMES A. SKIL'roN, W. H. MaGINNIs.

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